Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS
Abstract
Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a LiD target. In both cases, the amplitudes of the and modulations show strong kinematic dependences for both positive and negative hadrons. It has been known since some time that the measured final-state hadrons in those SIDIS experiments receive a contribution from exclusive diffractive production of vector mesons, particularly important at large values of , the fraction of the virtual photon energy carried by the hadron. In previous measurements of azimuthal asymmetries this contribution was not taken into account, because it was not known that it could distort the azimuthal modulations. Presently, a method to evaluate the contribution of the exclusive reactions to the azimuthal asymmetries measured by COMPASS has been developed. The subtraction of this contribution results in a better understanding of the kinematic effects, and the remaining non-zero modulation gives indication for a non-zero Boer-Mulders effect.
Keywords
Cite
@article{arxiv.1912.10322,
title = {Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS},
author = {J. Agarwala and M. G. Alexeev and G. D. Alexeev and A. Amoroso and V. Andrieux and N. V. Anfimov and V. Anosov and A. Antoshkin and K. Augsten and W. Augustyniak and C. D. R. Azevedo and B. Badelek and F. Balestra and M. Ball and J. Barth and R. Beck and Y. Bedfer and J. Berenguer Antequera and J. Bernhard and M. Bodlak and P. Bordalo and F. Bradamante and A. Bressan and M. Buechele and V. E. Burtsev and W. -C. Chang and C. Chatterjee and M. Chiosso and A. G. Chumakov and S. -U. Chung and A. Cicuttin and P. M. M. Correia and M. L. Crespo and D. D'Ago and S. Dalla Torre and S. S. Dasgupta and S. Dasgupta and I. Denisenko and O. Yu. Denisov and L. Dhara and S. V. Donskov and N. Doshita and Ch. Dreisbach and W. Duennweber and R. R. Dusaev and A. Efremov and P. D. Eversheim and M. Faessler and A. Ferrero and M. Finger and M. Finger and H. Fischer and C. Franco and J. M. Friedrich and V. Frolov and F. Gautheron and O. P. Gavrichtchouk and S. Gerassimov and J. Giarra and I. Gnesi and M. Gorzellik and A. Grasso and A. Gridin and M. Grosse Perdekamp and B. Grube and A. Guskov and D. von Harrach and R. Heitz and F. Herrmann and N. Horikawa and N. d'Hose and C. -Y. Hsieh and S. Huber and S. Ishimoto and A. Ivanov and T. Iwata and M. Jandek and T. Jary and R. Joosten and P. Joerg and E. Kabuss and F. Kaspar and A. Kerbizi and B. Ketzer and G. V. Khaustov and Yu. A. Khokhlov and Yu. Kisselev and F. Klein and J. H. Koivuniemi and V. N. Kolosov and K. Kondo and I. Konorov and V. F. Konstantinov and A. M. Kotzinian and O. M. Kouznetsov and A. Koval and Z. Kral and F. Krinner and Y. Kulinich and F. Kunne and K. Kurek and R. P. Kurjata and A. Kveton and K. Lavickova and S. Levorato and Y. -S. Lian and J. Lichtenstadt and P. -J. Lin and R. Longo and V. E. Lyubovitskij and A. Maggiora and A. Magnon and N. Makins and N. Makke and G. K. Mallot and A. Maltsev and S. A. Mamon and B. Marianski and A. Martin and J. Marzec and J. Matousek and T. Matsuda and G. Mattson and G. V. Meshcheryakov and M. Meyer and W. Meyer and Yu. V. Mikhailov and M. Mikhasenko and E. Mitrofanov and N. Mitrofanov and Y. Miyachi and A. Moretti and A. Nagaytsev and C. Naim and D. Neyret and J. Novy and W. -D. Nowak and G. Nukazuka and A. S. Nunes and A. G. Olshevskiy and M. Ostrick and D. Panzieri and B. Parsamyan and S. Paul and H. Pekeler and J. -C. Peng and F. Pereira and M. Pesek and D. V. Peshekhonov and M. Peskova and N. Pierre and S. Platchkov and J. Pochodzalla and V. A. Polyakov and J. Pretz and M. Quaresma and C. Quintans and S. Ramos and G. Reicherz and C. Riedl and D. I. Ryabchikov and T. Rudnicki and A. Rybnikov and A. Rychter and V. D. Samoylenko and A. Sandacz and S. Sarkar and I. A. Savin and G. Sbrizzai and H. Schmieden and A. Selyunin and L. Sinha and M. Slunecka and J. Smolik and A. Srnka and D. Steffen and M. Stolarski and O. Subrt and M. Sulc and H. Suzuki and A. Szabelski and P. Sznajder and S. Tessaro and F. Tessarotto and A. Thiel and J. Tomsa and F. Tosello and A. Townsend and V. Tskhay and S. Uhl and B. I. Vasilishin and A. Vauth and B. M. Veit and J. Veloso and B. Ventura and A. Vidon and M. Virius and M. Wagner and S. Wallner and M. Wilfert and K. Zaremba and P. Zavada and M. Zavertyaev and M. Zemko and E. Zemlyanichkina and Y. Zhao and M. Ziembicki},
journal= {arXiv preprint arXiv:1912.10322},
year = {2020}
}
Comments
13 pages, 7 figures